Island



E. BACH. SELF-OPENING KNUR'LING TOOL.

' APPLxcATIoN FILED 1uLY25, 1921.

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s SR1@ UNITED STATES EMMANN BACH, 0F WOON'SOCKET, RHODE ISLAND.

SELF-OPENING .'KNUBLIN'G TOOL.

Application filed July 25,

To all u1/0m it may concern.'

Be it known that EMMANN BACH, a citi-` zen of the United States, and a :resident of Woonsocket, in the county of Providence, State of Rhode Island, have invented certain new and luseful Improvements inSelf-V Opening Knurling Tools, of which the following is a specification.

The fundamental object of this invention is to provide a knurling-tool device, of the self-opening type, by the use of which time will be saved in performing the operation of knurling, as compared withl other forms of knurling-tools. Whereas, with the'ordi-y nary tool,fit is necessary to feed forward and back slowly over the work, my tool completes the knurl in. passing once over the work, automatically opening at the desired point, and being quickly withdrawn, thereby saving the time usually required for feeding back, and avoiding the possibility of cross-knurling, common to other tools. The` construction of my tool is suchthat, by locking it at the'desired point, it may be advantageously used where it is desired to start the knurl some distance from the end of a piece,-which is impossible inthe use of other tools with which I am familiar.

The accompanying drawing clearly shows an exemplary construction ea able of carry-y ing out the underlying principles of the invention. Like referencevcharacters denote corresponding parts throughout the several views. Briefly described:

Figure l is an end view of the device;

Figure 2 is a'view in top plan, partly in section, of the device; v

Figure 3 is a view in side elevation, partly in section, of the device.

Referring, now, in detail to the drawing:

A designates the chuck of a hand screw, single-spindle automatic, or like machine, B the piece kor work to be knurled, and C an adjustable tripper, or knock-oif rod, suitably carried by the machine, for the purpose hereinafter appearing.

D is the shank yof the knurling device which shank is held rigidly in the turret of the-screw machine, and is integral with a head, D', having a reduced concentric neck, D2, bearing at one end, al, against an end platey or disk O, having a concentric, circular, central aperture, 0, tting the shank, D. The head, D', is provided with Va longitudi- Specication of Letters Patent.

Patented July 11, 1922. 1921. Serial No. 487,835.

nally-extending, concentric bore, d', for the reception of the work B in the operation of the device. The end plate or disk, O, and the neck, `D2, are sultably detachably secured together, as by screws, al".

I K designates a rotatable cam-ring, which maiy be of the same diameter as the disk or en y plate, O, and which is adapted to bear, aty one end thereof, against said disk. The cam-ring encircles the neck, D2, of the head D', and is provided with a circumferential camgroove,]c, for the purpose resently appearing. The cam-ring may be provided, on its periphery, with a radially-projecting handle, N.

Suitable means may be provided for limiting .the degree of rotatable movement of the cam-ring,\K, on the neck, D2; in this instance, complemental, co-acting stop-pins I, J, are, reslpectively, eccentrically carried by the ring, and the plate, O.

Suitable means are provided for automatically rotating the cam-ring,in this instance, a spring-motor, ,comprising a coiled spring, U, is disposed in the recessed portion, n, of the cam-ring, K,`and is operatively associated with said ring and with the disk O, so as to turn the cam-ring, as more fully hereinafter-.appearing in the description of the operation of the device. Seated in diametrically oppositely disposed, radial recesses, d2, in the head, D', and having a limitedtilting movement therein, are levers, L, L, mounted for tilting movement on pins, d3, carried by the head, D', and extending transversely across said recesses. Each of said levers has a lateral head, Z, -in which is disposed a knurlingroller, T. Collar-screws, S, serve to adjust the rollers for different diameters of work, within its range; and, by means of setscrews, Q, co-operating with V-shaped notches in the Shanks of the roller-holders, R, adjustment may be made for making any type of kknurl, either square, diamondshaped, spiral, or straight.

Each o f the levers, L, is provided with a lateral projection or toe, Z', into and out ot contact with which rides the cam-surface or track, It, of the cam-ring K.

(lo-operating with each lever, L, is a leaf spring M seated in a longitudinally-extending, peripheral groove, m', in the neck, D2, of the head, D', Each leaf spring is suitably springs end, in a notch, Z2, in the lever, L. The tendenc of the leaf, ,s rin v L levers, IZ, in a direction oli t t e knurlingrollers, T, clear of the Workyiei l To bring the rollers, T, into operative sition with res ect 'to thepverk, B, it is neS- sary to turn `t e camr1`ng,`K, to bring the proper portion of the cam-@rimesse track,- k, of the cam-ring into contact with the toes, z', `of the 1eme, fr., what of :the cam-track functions tio tilt the levers, against the inuenee of the epiiings, =M, to move the rollers, T, towardfiand inte eonta'ctwith the work, B. In this-movement et the cemring, 'thsvcamrspringg U, isrcon'ipreesed.-

- Suitable meam arelprovidedfor rveleaei assi?" locking the cam-ting vin the j reiemeii to, with Vthe spring, oom'- pnese'ed. In this instance, allateh, Reis pijovided, whiohilis mounted @for tiltin move'- ment on a pivot-pin, f, carried lby heed, D@ The latch is seated in a peripheral reease, f', in the beam/D', aa'idfis` rovided with a toe, f2, which is ada ted, in the looking meition of the oem-ringyf ,to seat in a peri hand' er e,'-G,'in the cam-ring,

thereby holding the latter against rotation. A curved leaf-spring]a `beneath the latch lerve'a to Phold it in operative position, E designates a bell-crank lever, ulcrum'ed at e inthefcess,f,=the shorterarm-of' the lever-having a kmuckleyeengaging a correspoldingiy-ehaped reeenmfepin one end of -i l v y -f The adjustable relatively stationary tnipper, C', is entangled-in the pathfoi movement of the longer amm of 'eheheh-crank levier, E, so that, in the ottoni-device, said langenfam ystrikes again* the Afree yend of ythe trippmy which weeksuthe boli-crank lever on 'nadeln-um, thus-tilting the latch, Eto movethe tue, fa tliereoi'eut of lmikingl engagement zinrthe groove, G, *whereupon the spring motor, U, unetions to notate `the cam-ring, K, -in the dirwtien'rofthe arrow in 1, through an are ot sheet-20. The cam-tank, hiduringthis-mevenient o'the cumming, releases itse 3&1 t with the tees, Z,.of the levens, L,w reupon the lea!- M, unctionte rock said levers' en their iul'cruins, thereby moving the rol-lere, T',-T, out of-contactwith thework, B. The devine may be leaked in .eperative'psition for knurling, by hand cir-otherwise, as desired. l l i i' 'Y' Whi'le the device, as shown, is essentially ier use on a hand-screw, orsinglespindle automatic, where tlm'work iievolves, it can obviously be modified for 'use 'en a six-spindie automatic or like mmhine,I inwhieh the tool rotates;y y

It will be seen that the device automatically opens atthe point, and may be tilt. the

quickly withdrawn, thereby saving the time rejuwedlfoi'feeding back and avoiding the possibility of cross-knurling which charac rizes other tools.

avingv thus fully described my invention,

whatl daim as new and desire to secure by letters-Patent is:

l. A. self-opening knurling-tool device, comprising a shank adapted to be held rigidly in'theturret of a screw-machine, tiltable, knurling-tool holding members carried by said shank, spring means also carried by said shank Vandeng'aging said members to tilt zthe tool-holding ends of the latter away from the work, a cam-member carried by said shank andengageable with said toolhdldin 'members to tilt the tool-holding ends o5 the-latter toward the work, andl a s ring operatively associated with said nlrand said eem-member for moving said eem-member to release said tool-holding members. f2; AI .self-opening knurling-tool device, comprising ashankadapted to he held rigidly `in the turret of a screw-machine, tiltable, knurling-tool holding members carried by-eeid shank, spring means also carried by said 5sha-nk `and#engaging said' members to tilt the tool-holding ends of the iatter away from `the work, a rotatable cam-ring carried by-said shank and engageable with said tool holding members to tilt the tool-holding ends-of the latter toward the werk, and a sprin -mobor operatively associated with said" ank and saidcam-ring for movin the latter'vto-release said tool-holding4 mem rs. e. il-'opening knurling-bool device, comprising a shank adapted to be held rigidlyvi'the "turretV ofa screw-machine, tiltable-kimln'g-teol holding members carried byf'faid shank and having lateral toes, sp1-i carried 'by saidshank and engagin aid embeisto-tilt the tool-holding en s thereof away from the work, arotatable cam-ring carried by said shank and havin a cam-track engageable with said tool-hol lng'members to tilt the'tcol-holding ends of the latter toward the work, and a 'spr'n meten operatively associated with v sai shank and cam-rin for moving the latter teiel'ease saidtoollding members. "'41 4A self-opening knurling-tool device, comprising a'shank adapted to be held ri idly in the turret of a screw-machine, tialble knurlin tool holding members carried by said sha springs also carried by said shank and engaging said members to tilt the tool-holding ends thereof away from the work, a retable cam-ring carried by said shank'anden geable with said tool-holding members te' t1 t the tool-holding ends thereafterward the work, a sp1-i motor operativ'ely asse'ciated with said s ank and said ca'm-rinformoving the latter to release said teo -holding members, and a latch carried by said shank and engageable With said cam-ring to hold the same against rotation under the influence of said motor.

5. A self-opening knurling-tool device, comprising a shank adapted to be held rigidly in the turret of a screw-machine, tiltable lnurling-tool holding members carried by said shank, springs also carried by said shank and engaging said members to tilt the tool-holding ends thereof away from the Work, a rotatable cam-ring carried by said shank and engageable With said tool-holding members to tilt the tool-holding ends thereof toward the Work, a spring motor operatively associated With said shank and said 15 cam-ring for moving the lattei` to release said tool-holding members, a tiltable latch fulcrumed on said shank and engageable With said cam-ring to hold the same against rotation under the influence of said motor, 20

signature.

Ell/[MANN BACH. 

